Air Services Australia said there has been a "system software failure".
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Sydney Airport ✈️ ✔ @SydneyAirport
Flights are delayed due to an @AirservicesNews system issue. Please check with your airline for flight status. Thanks for your patience.
7:24 AM - Sep 25, 2017
The ABC understands the fault relates to the flight planning system. This feeds into the radar picture and without it, controllers cannot see which plane is which.
It is also believed the data connection between Sydney and Melbourne is down.
The Qantas departure board lists flights to Melbourne, Brisbane and Adelaide "delayed due ATC Radar Failure".
Last edited by RodH; 24th Sep 2017 at 22:41.
Reason: Unnecessary data